Apparatus for forming concrete piles



Sept. 6, 1932. E. D. wA'rT A 1,875,335

' APPARATUS Fon romane concnm PILEs Filed Aug'. 12, 195o 2 sheets-sheet 1 F IGI. y l

All,"

` 1N ENToR BY ATTORNEYl v CMM M01/11+ Sept. 6, 1932. E. E, WAT-|- 1,875,835

`APPARA'IUS FOR FORMING CONCRETE PILES Filed Aug. 12, 1930 2 Sheets-Sheet 2 FIGS. Flc-1 7.

INH

fr f as I 30 l 32 l' 2o 22. 34

l v l 6 M o *#4 E: 6 V 2O 2o j? 32. s 22 34 INVENTOR '-moval of the core.

Patented Sept. 6, 1.932

UNITED STATES 'P'ATENu 4orales ELIHU D. WATT, OF LAGRANGE, ILLINOIS, COMPANY, 0F NEW YORK, N. Y., A QQQPOMQQFON .QE v V animamos ron roaminecoucnnrn rinus Application led August 12, 1930. Serial N9. 474,174.5, 1 i

This invention is an improvement on the invention disclosed in Patent No. 1,491,832 entitled Apparatus for making concrete piles and issued April 29, 1924, to M. M. Upson, in which was described apparatus comprising a corrugated collapsible core for driving corrugated sheet metal shells. u

An object of the present invention is to adapt the apparatus for the driving of concrete instead of sheet metal shells. Another object is to so modify the corrugations of shell and core as to give better results in practice.

Further and other objects and advantages will be apparent from the specification and claims, and from the accompanying drawings which illustrate what is now considered to be the preferred embodiment of the inventions.

Fig. 1 shows a collapsible, non-taper triplethreaded core with driving head.

Fig. 2 is a cross-section of a concrete shell section adapted for use with the core in Fig. 1.

Fig. 3 is a cross-section of a shell comprising several sections, after driving and re- Fig. 4 is a cross-section of a stack of shell sections in driving position on the core of Fig. 1.

Fig. 5 is an enlarged view of the upper part of Fig. 4 with the core in section to show details of the mechanism thereof.

Fig. 6 is a view on line 6-6 of Fig. 5.

Fig. 7 is a fragmentary view of a portion of Fig. 6 showing the core collapsed.

Fig. 8 shows a modified form of shell.

Fig. 9 shows the driving core engaged with the shell of Fig. 8.

Referring to the drawings, Fig. 1 shows in expanded form the exterior of a Vdriving core of a kind suitable for thev practice of the present invention. It is provided with leaves 20, arranged for inward and outward operation vby axial rod 22 through the instrumentality of toggle links 24 (Figs. 5, 6 and 7 in the well known manner when rod 22 is raised or lowered by mechanism in driving head 26.

The surface of the core is covered with corrugations, preferably in the form of comparatvely fine screwv lthreads 28.

thread shownis atriple A-thre ad,rb1,1t `the mul? tiplicity of the threading maybe anything desired. The corrugations vmay eveny be in the form of parallelrings.` A shell section in its preferredlform is shown in Figi 2. It is of `concrete 30, `covered by a casing of thin steel '32, which projects pwardlybeyond concrete 30 seras to overlap the shellsection above it when theY sections are stacked. The inner surface of concretel 3() is provided with ff threaded ucorrugations preferably formed by wire 34 partially embeddedin v the concrete. This wire is of suitablefsize to engage' the Vcore threads V28 and is'arranged a ,sin le thread having Vthe same pitehsasthe triple thread on the core, so that when the core is expanded into the shell (Fig. 5) only every third thread of the core is engaged by a thread of the shell.

In operation the core is suspended in collapsed condition and the stack of shell sections is assembled end to end thereon. Then the core is expanded into the shell. If` the threads of core and shell should not happen to register at once all that is required to bring them to registry is one or two light blows of the hammer on head 26.

The assembly is provided with a driving shoe 36 as in Fig. 4. After the assembly is driven to proper depth the core is collapsed and removed, leaving a hollow shell as in Fig. 3, ready to be filled with plastic concrete to form the monolithic pile.

Instead of forming the shell with threads of reinforcing` wire 34 a modication as shown in Fig. 8 may be used in which an inner sheet metal lining 40 is provided, threaded with a single thread 42 of proper form to engage one of the multiple threads of the core, as in Fig. 9. In this modification, threads 42 are of course reinforced by lar concrete lining therein, driving projections extending inwardly of the bore of said lining and of a material dierent from that of the lining to reinforce said lining, and a driving core having corrugations engageable with said projections, together with; means to expand and contract said core: Y

, 2. The invention set forth in claim 1 in which the distance between projections in the shell is a multipleofthedistancebetween corrugationsinthe core whereby there Y A are unengaged corrugations on the core between each adjacent pair of engaged corrugations on the core.

v3. The invention set'lforthin claim ll'in which the corrugations on thel core are inV therform of `a multiple screw thread, and the projections in the shell are in the form of a single screw thread of the same pitch as said multiple thread. l A

4. The invention setrforth in claim 1 in which the projections in the shell are formed by wires partially embedded in' the concrete of the shell and projecting therefrom. Y

5. The inventionset orthrin claim l in which the inner surface of the shellis lined with sheet metal and the shell projections are formedin said sheet metal, substantially as described. v

In testimony whereof I hereto affix my signature.

ELIHU D. WATT. 

